Merge pull request #41 from SacNaturalFoods/master

added allow_tags = True to methods rendered in the modeladmin list display for Django < 1.5 compatibility
Fixed #40
Added copy button. Still need to add icon instead of the word
"copy".
Added icon to copy report
Made download icon into svg (Thanks @shirleyleu)
Removed empty border space on icon
Update README.md
Updated screenshots
Update README.md
Fixed #38 Added optional export to report feature in django admin
Merge branch 'master' of https://github.com/burke-software/django-report-builder
Update README.md
Increment version for pypi
Added some tests
Added staff_required to ajax views
urls.defaults are deprecated, removed.
Truncate sheet titles to produce valid xlsx file
Range filters now work
Fixed #43
Get all properties from class
using http://stackoverflow.com/a/1215609/443457
Fixed 42
Making Filter Type verbose a bit shorter to save width
Filter type "in" should work now
ValueError's are now caught
Fixed #44
Removed unneeded static files
Fixed #45
Removed some hard coded static references
See issue #46